Initial commit: dating app backend (Go/Gin/GORM/Postgres)

Phone+OTP auth, staged onboarding, admin approval workflow, and a
full discovery/swipe/match/chat system with photo upload and
approximate distance (haversine) based on user location.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/utils/age.go

@@ -0,0 +1,16 @@
+package utils
+
+import "time"
+
+// CalcAge سن رو از تاریخ تولد حساب می‌کنه (نسبت به الان)
+func CalcAge(birthDate *time.Time) int {
+	if birthDate == nil {
+		return 0
+	}
+	now := time.Now()
+	age := now.Year() - birthDate.Year()
+	if now.Month() < birthDate.Month() || (now.Month() == birthDate.Month() && now.Day() < birthDate.Day()) {
+		age--
+	}
+	return age
+}